package org.csu.mypetstore.util;

import java.security.MessageDigest;

public class MD5Util {

    /**
     * MD5加密
     * @param inStr 输入字符串
     * @return 生成32位md5码
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");

        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }

        //字符流转化
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {

            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

    /**
     * 解密算法，执行一次加密，两次解密
     */
    public static String convertMD5(String inStr){
        char[] a = inStr.toCharArray();
        for(int i=0;i<a.length;i++){
            a[i] = (char)(a[i]^'t');
        }
        String s = new String(a);
        return s;
    }


}
